Customization for Corvette Grand Sport 2017

I'm asking here for more choices on customization for a car. The Corvette Grand Sport from 2017. 

Actually in the game there's 3 Corvette, the Grand Sport, ZR1 and Z06 (And for deluxe editon we have Grand Sport K.S edition)

But, on the Grand Sport 2017, there's missing option i swear, or it's illogic. I saw many times IA using the Grand Sport edition BUT they have the rear wing of the K.S Edition. And as i player i can't add that wing to my car cause it's simply unavailable, so why IA can use it on their car ??? At least, if you want to make the K.S customization "exclusive" let us change color for the K.S edition. Or just had that rear wing please...